Lincoln 2014 MKZ Owner's Manual page 294

and inspected in case it needs to be
repaired or replaced. For your safety,
tires that are damaged or show signs
of excessive wear should not be used
because they are more likely to blow
out or fail.
Improper or inadequate vehicle
maintenance can cause tires to wear
abnormally. Inspect all your tires,
including the spare, frequently, and
replace them if one or more of the
following conditions exist:
Tire Wear
E142546
When the tread is worn down to one
sixteenth of an inch (2 millimeters),
tires must be replaced to help prevent
your vehicle from skidding and
hydroplaning. Built-in treadwear
indicators, or wear bars, which look
like narrow strips of smooth rubber
across the tread will appear on the tire
when the tread is worn down to one
sixteenth of an inch (2 millimeters).
When the tire tread wears down to the
same height as these wear bars, the
tire is worn out and must be replaced.
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Wheels and Tires
Damage
Periodically inspect the tire treads and
sidewalls for damage (such as bulges
in the tread or sidewalls, cracks in the
tread groove and separation in the
tread or sidewall). If damage is
observed or suspected have the tire
inspected by a tire professional. Tires
can be damaged during off-road use,
so inspection after off-road use is also
recommended.
Age
as weather, storage conditions, and
conditions of use (load, speed,
inflation pressure) the tires experience
throughout their lives.
In general, tires should be replaced
after six years regardless of tread
wear. However, heat caused by hot
climates or frequent high loading
conditions can accelerate the aging
process and may require tires to be
replaced more frequently.
You should replace your spare tire
when you replace the road tires or
after six years due to aging even if it
has not been used.
291
WARNING
Tires degrade over time
depending on many factors such